JP2505797Y2 - Compacting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a powder compacting apparatus, and more particularly to a powder compacting apparatus for molding a powder compact having a concave portion or a convex portion at an upper end thereof.

[Prior art]

2. Description of the Related Art In recent years, various products have been put into practical use in which a powder compact formed by using a powder material containing an alloy component or the like is sintered to improve mechanical properties such as wear resistance.

Generally, in a powder compacting apparatus used for powder compacting, the lower die and the die plate are configured such that their upper end surfaces form a flat surface at the same level, and the lower die punch is relatively opposed to the lower die. The powder feeding shoe for filling the powder material in the cavity formed by the lower die and the lower punch, which is vertically movable, is disclosed in, for example, Japanese Utility Model Publication No. 51-7804. The powder material filled in the cavity is reciprocally provided along the upper end surface of the lower die and the die plate, and the powder cutting plate of the powder feeding shoe cuts the powder material into the same level as the upper surface of the lower die. After that, the powder material is compressed by the upper die punch to mold the powder compact.

In the above-mentioned powder compacting device, the powder material filled in the cavity is powder-cut into a flat shape at the same level as the upper end face of the lower die, so that a compacted product having a concave portion or a convex portion at the upper end portion is formed. In that case, since the compression ratios of the portion corresponding to the concave portion or the convex portion and the other portion are different, the powder material is molded into a powder-molded product having an uneven density distribution, and the quality of the powder-molded product deteriorates. . Further, since an excessive amount of powder material is filled in the cavity to form a powder compact having a concave portion or a convex portion, the expensive powder material is excessively consumed and the raw material cost becomes high.

Therefore, in Japanese Utility Model Application Laid-Open No. 58-116998, a die is formed with a groove adapted to the shape of a powder molded product, and a dusting piece of a powder feeding shoe is formed with an engaging portion engaging with the groove. , A powder molding technique in which powder is supplied according to the shape of the powder molded product. In Japanese Utility Model Publication No. 61-26325, a scraping chamber is provided on the front side of the powder feeding shoe, and the upper end of the powder supplied to the cavity through the scraping plate equipped in the scraping chamber is adjusted to the shape of the powder molded product. There is described a powder feeding device which is scraped into a concave shape. In Japanese Patent Laid-Open No. 59-166601, a semi-round bar extending in the reciprocating direction of the powder feeding shoe is provided on a portion of the upper surface of the die other than the cavity, and the powder feeding shoe is provided in a penetrating shape to form a round rod-shaped powder A powder molding technique is described in which powder is supplied in conformity with the shape of the upper half of the product.

[Problems to be solved by the device]

According to the technique described in the above publication, the powder is supplied so as to fit the shape of the powder molded product, and the density distribution of the molded product can be made uniform to improve the quality of the powder molded product. There is no disclosure of a technique for precisely cutting powder through a cutting member. Moreover, there is no disclosure of a technique for collecting the powder that has been powder-cut through the powder cutting member of the powder feeding shoe without waste.

The object of the present invention is to enable accurate powder cutting through the powder cutting member of the powder feeding shoe, to collect the powder cut without waste, and the like.

[Means for Solving the Problems] The powder compacting apparatus according to claim 1 is a die plate, a lower die, a lower punch fitted in the lower die so as to be movable up and down, and a lower die. In a powder compacting device equipped with a powder supply shoe that supplies powder material to a cavity formed by a lower die punch, the powder compacting product is formed at the upper end of the powder compact so as to extend parallel to the reciprocating direction of the powder supply shoe. A groove or ridge having a cross-sectional shape that corresponds in position and is similar to the recessed portion or the raised portion is formed parallel to the reciprocating direction of the powder feeding shoe and within the reciprocating range of the powder feeding shoe. And a first die cutting plate and a second dust cutting plate are provided on the forward end and the return end of the powder feeding shoe, respectively.
Engaging portions that engage with concave grooves or ridges are formed at the lower ends of the first and second powder cutting plates, respectively, and the second powder cutting plate passes through the cavity when the powder feeding shoe moves forward, The first powder cutting plate is configured to pass through the cavity when the powder feeding shoe returns.

According to a second aspect of the present invention, in the device of the first aspect, when the powder feeding shoe is moved back, the powder material cut by the second powder cutting plate is moved to the limit position for returning the powder feeding shoe. It is provided with a powder receiving means for receiving when it reaches.

[Action]

In the powder compacting apparatus according to claim 1, a cross-sectional shape corresponding to and similar to a concave portion or a convex portion formed in the upper end portion of the powder compact so as to extend in parallel with the reciprocating direction of the powder supply shoe. Concave groove or ridge is formed on the upper surface of the die plate and the lower die to be parallel to the reciprocating direction of the powder feeding shoe and in the reciprocating range of the powder feeding shoe, and to the forward side of the powder feeding shoe. A first dust-cutting plate and a second dust-cutting plate are provided at the end and the return-side end, respectively, and the lower ends of the first and second dust-cutting plates are engaged with concave grooves or ridges. Since the engaging portion is formed, the upper end portion of the powder material filled in the cavity as the powder feeding shoe moves is the concave portion or the convex portion formed on the upper end portion of the powder compact by the engaging portion of the powder cutting plate. Is cut in a shape corresponding to and similar to the position.

Therefore, since the powder material thus cut and filled in the cavity is compressed at substantially the same compression ratio in each part, it is possible to form a powder molded product in which the density distribution of the powder material is made uniform. It is possible to improve the quality of the powder molded product.

In addition, since a powder compact having a concave portion or a convex portion can be molded by filling a required amount of powder material in the cavity, excessive consumption of expensive powder material can be prevented, and raw material cost can be reduced.

In particular, when the powder feeding shoe moves forward, the second powder cutting plate passes through the cavity, and when the powder feeding shoe moves backward, the first powder cutting plate passes through the cavity. In addition, since the first and second powder cutting plates can perform powder cutting three times, the powder cutting performance can be significantly improved, the consumption of expensive powder materials can be reduced, and the raw material cost can be reduced. .

In the powder compacting apparatus according to claim 2, the powder material chopped by the second powder cutting plate when the powder feeding shoe is moved back is received when the powder feeding shoe reaches the return limit stop position. Since the powder receiving means is provided, the powder material cut by the second powder cutting plate can be reliably collected in the powder receiving means.

[Effect of device]

According to the powder compacting apparatus of claim 1, as described in the above [Operation], the groove or the convex groove formed on the upper surfaces of the die plate and the lower die, and the first and second powder cutting plates. And an engaging portion formed on the first and second powder cutting plates, the second powder cutting plate passes through the cavity when the powder feeding shoe moves forward, and the first powder when the powder feeding shoe returns. Since the cutting plate is configured to pass through the cavity, the
Since the powder cutting can be performed three times with the first and second powder cutting plates, the powder cutting performance can be significantly improved, the consumption of expensive powder material can be reduced, and the raw material cost can be reduced.

According to the powder compacting apparatus of claim 2, as described in the above [Operation], when the powder feeding shoe moves backward,
Since the powder receiving means is provided for receiving the powder material cut by the powder cutting plate when the powder feeding shoe reaches the return limit stop position, the powder material cut by the second powder cutting plate is powder received. It can be reliably collected by the means.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the present embodiment, the present invention is applied to a powder compacting apparatus S for compacting a cap C mounted on a crankcase of an automobile engine and supporting a journal portion of a crankshaft.

First, the cap C will be briefly described. As shown in FIG. 5, the central portion of the upper end surface of the central portion of the cap C has a downwardly concave shape, and the central portion of the lower end surface has a downwardly convex shape. The upper and lower wall thicknesses of the cap C are formed to be the same except for the projecting portions Ca at the front end portion and the rear end portion, and the central portion of the upper end surface of the cap C is a recess where the journal portion of the crankshaft abuts.
Cb is formed, and a front portion and a rear portion of the upper end surface form contact portions Cc that contact the wall portion of the crankcase, and front and rear contact portions Cc are flush with each other. Further, a bolt hole Cd for vertically inserting a bolt is formed in a front portion and a rear portion of the cap C.

The powder compacting device S will be described. As shown in FIG. 1, at the lower end of the upper ram 1 that is reciprocally driven by a crank press mechanism to a raised position (shown by a solid line) and a lowered position (shown by a chain line), An upper die punch 4 including a first punch 2 having a pin fitting hole 2a and a second punch 3 fitted in the first punch 2 is provided below a hydraulic cylinder (not shown) provided below the bolster 5. A yoke plate 7 is fixed to the upper end of the side ram 6, and a pair of left and right support rods 8 are erected on the front end and the rear end of the upper surface of the yoke plate 7, and each support rod 8 is fixed to the bolster 5. A through hole 9a formed in the base block 9 is vertically movably inserted, and above the base block 9, a first rectangular parallelepiped die plate 10 fixed to the upper end of each support rod 8 is provided.

A lower die die 14 having a cylindrical shape and having a die portion 15 penetrating in the up-down direction is internally fitted and mounted in a substantially central portion of the first die plate 10, and the lower die die 14 has a ring shape. It is fixed to the first die plate 10 via the second die plate 11, and a ring-shaped closing plate 12 is provided on the upper surface of the second die plate 11.

The first die plate 10, the second die plate 11, and the closing plate 12 constitute a die plate 13, and a cap C formed in the cavity 19 among the upper end surface of the die plate 13 and the upper end surface of the lower mold die 14. At the portion corresponding to the concave portion Cb at the upper end of the concave groove 20 having a concave cross section substantially the same as the concave portion Cb
(See FIG. 2) are formed continuously in the left-right direction, and the upper surfaces of the die plate 13 and the lower die 14 except for the concave groove 20 have the same level plane, and the die plate 13 and the lower die 14 have the same level.
Can be switched between the forming position shown by the solid line and the take-out position shown by the chain double-dashed line by the lower ram 6.
The shape of the groove 20 is determined in consideration of the angle of repose of the powder material 25 filled in the powder-cutting cavity 19.

A lower die punch 17 having a die portion 16 formed on the upper end is erected on the upper surface of the base block 9, and the lower die punch 17 is fitted in a die portion 15 of a lower die die 14 so as to be capable of relative vertical movement. On the upper surface of the yoke plate 7, the base block 9 and the lower die punch 17 are provided.
Two core pins 18 for inserting the through holes 9b and 17a formed in the above and extending upward to form the bolt holes Cd of the cap C
Is stuck.

When the die plate 13 and the lower die 14 are at the molding position, the lower die 15 has a die portion 15 and the lower punch 17 has a die portion.
The core pin 18 projects into the cavity 19 formed by 16 and
When the die plate 13 and the lower die 14 are in the take-out position, their upper surfaces are flush with the flat surface of the die section 16, and the upper ends of the core pins 18 are retracted into the insertion holes 17a. .

Next, a powder feeding device 30 for filling the molding cavity 19 with a powder material 25 in which powders of various alloy elements containing steel powder as a main component are mixed will be described.

As shown in FIGS. 2 to 4, the powder feeding device 30 includes a pair of front and rear guide members 40 which are arranged in the left-right direction on the front side and the rear side of the lower die 14 and fixed to the die plate 13.
And a powder feeding shoe 50 and the like provided so as to be reciprocally movable in the left-right direction along the guide member 40.

The left and right end portions of the front and rear guide members 40 are provided with powder receiving boxes 42 and 43, respectively, and the groove 20 is provided in the left portion of the guide member 40.
A dispensing plate 44 having an inclined portion 44a for dispensing the powder material 30 from the left end portion and the vicinity thereof to the powder receiving box 42 is provided. In addition, the right end of the groove 20 is the opening 43 of the powder receiving box 43.
connected to a.

The powder feeding shoe 50 includes a frame member 51 and a frame member that are rectangular in plan view.
A powder feeding box 52 having an open lower end, which includes a lid member 52 fixed to the upper end of 51 and having an opening 52a, and left and right wall portions 51a of the frame member 51.
The frame member includes a guide plate member 53 fixedly attached to the guide plate member 53, left and right powder cutting plates 54 and 55, and a rubber extruding member 56 fixed to the left end surface of the left guide plate member 53. A portion of the lower end of 51 other than the portion corresponding to the concave groove 20 is disposed between the front and rear guide members 40 in a state of being in contact with the upper surface of the die plate 13.

A flexible powder feeding hose 57 for supplying the powder material 25 into the powder feeding box 52 is fixed to the opening 52a of the lid member 52, and the powder feeding hose 57 is connected to a powder feeding hopper (not shown). The powder feeding shoe 50 can be reciprocated between a powder feeding position shown by a solid line in FIG. 3 and a dispensing position shown by a two-dot chain line by a moving mechanism (not shown).

The left and right powder cutting plates 54, 55 are vertically movably inserted into the guide portions 53a of the left and right guide plate members 53, respectively, and the flange portions 54b, 55b formed at the front and rear portions of their upper ends are inserted. Bolts 58 are fixed to the frame member 51, and the powder cutting members 54, 55 are urged downward by the spring members 59 inserted into the bolts 58.

The front and rear widths of the left and right powder cutting plates 54 and 55 are the lower die 14
It is formed to be slightly wider than the front-rear width of the mold portion 15, and as shown in FIG.
Convex engaging portions 54a and 55a are formed on the lower side of the die plate 13 so that the lower end portion except the engaging portions 54a and 55a is in contact with the upper surface of the die plate 13.

The operation of the powder compacting device S configured as above will be described.

When molding the cap C, the powder feeding shoe 50 is positioned at the powder feeding position, and then the ram 6 is driven to switch the die plate 13 and the lower die 14 from the take-out position to the molding position.

Next, from the powder feeding hose 57 to the powder feeding box 52, a predetermined amount of powder material
Supply 25.

Next, the driving mechanism drives the powder feeding shoe 50 toward the dispensing position. When the powder feeding shoe 50 passes through the cavity 19, the powder material 25 is filled in the cavity 19 from the powder feeding box 52. At this time, the powder material 25 is filled in a state of slightly rising from the cavity 19.

Next, when the powder cutting plate 55 on the right side passes through the cavity 19, the upper end portion of the powder material 25 filled in the cavity 19 is moved to the upper end surface of the cap C by the powder cutting plate 55 as shown in FIG. It is cut into the corresponding shape. The powder material 25 that has been cut into powder moves to the delivery position side with the movement of the powder supply shoe 50, and when the powder supply shoe 50 reaches the delivery position, it is delivered to the powder receiving box 42 via the delivery plate 44.

Next, the powder feeding shoe 50 is driven to the powder feeding position side, the powder material 25 is filled in the cavity 19 and the powder cutting is performed by the powder cutting plate 54 on the left side in the same manner as described above. The powder is delivered to the powder receiving box 43 at the powder feeding position, and the filling of the powder material 25 into the cavity 19 is completed.

Next, the upper ram 1 is driven from the raised position to the lowered position, and the upper die punch 4 compresses the powder material 25 with a predetermined pressure, so that the powder material 25 is capped as shown by the two-dot chain line in FIG. Formed in C. At this time, since the upper end portion of the powder material 20 filled in the cavity 19 is cut into the substantially same shape as the upper end portion of the cap C, the powder material 20 is compressed at substantially the same compression ratio throughout. As a result, the cap C is molded in a state where the density distribution of the powder material 20 is uniform over the entire cap C, and the quality of the cap C can be improved.

Furthermore, the powder material 20 filled in the cavity 19 in an amount more than necessary is powder-cut by the powder cutting plates 54/55 and powder receiving boxes 42/43.
Since the powder material 20 is recovered and reused, wasteful consumption of the powder material 20 is eliminated, and the molding cost can be reduced.

When the molding is completed, the upper die punch 13 is driven to the raised position, the die plate 13 and the lower die are switched to the take-out position, then the powder feeding shoe 50 is driven to the pay-out position side, and the cap C is pushed by the pushing member 56. Are taken out on the die plate 13.

Note that it is also possible to mold a powder-compacted molded product having a convex portion extending in the left-right direction at the upper end, which is the reverse of the cap C. In that case, instead of the concave groove 20, a ridge having a sectional shape similar to and corresponding to the convex portion of the molded product is formed in the die plate 13 and the lower die 14, and the powder cutting plates 54 and 55 are formed. Instead of the convex engaging portions 54a and 55a, a concave engaging portion that engages with the ridge may be formed at the lower end.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a vertical sectional side view of a powder compacting apparatus, FIG. 2 is a plan view of the apparatus, and FIG. 3 is a main part of the apparatus. Front view in vertical section, Fig. 4 is Fig. 2
Fig. 5 is a sectional view taken along line IV-IV, and Fig. 5 is a perspective view of the cap. S: Powder compacting device, C: Cap, Cb: Recess, 13
…… Die plate, 14 …… Lower die, 17 …… Lower punch, 19 …… Cavity, 20 …… Groove, 25 …… Powder material,
54 ・ 55 …… Powder cutting plate, 54a ・ 55a …… Engagement part.

Claims (2)

(57) [Scope of utility model registration request] 1. A powder material is supplied to a die plate, a lower die, a lower punch fitted in the lower die so as to be movable up and down, and a cavity formed by the lower die and the lower punch. In a powder compacting device equipped with a powder supply shoe, which corresponds to and is similar in position to a concave portion or a convex portion formed at the upper end portion of the powder compact molded product so as to extend in parallel with the reciprocating direction of the powder supply shoe. The recessed groove or ridge having the cross-sectional shape is formed on the upper surfaces of the die plate and the lower die in parallel with the reciprocating direction of the powder feeding shoe and within the reciprocating range of the powder feeding shoe. A first dust-cutting plate and a second dust-cutting plate are respectively provided at the forward-side end and the backward-side end of each of the first and second powder-cutting plates. Engaging portions are formed so that the second powder cutting plate passes through the cavity when the powder feeding shoe moves forward. And, at the time of backward movement Kyuko shoe it is configured such that the first powder cutting plate passes through the cavity, compacting device, characterized in that. 2. A powder receiving means is provided for receiving the powder material powdered by the second powder cutting plate when the powder feeding shoe moves back, when the powder feeding shoe reaches the backward limit stop position. The powder compacting apparatus according to claim 1, characterized in that.